Your lastest upgrade that does not allow protected and unprotected pages to open is a disaster. I teach an online class that have links to external sources.
I teach an online course which started this past Tuesday at midnight. As I was checking all the links in the class, the pages that had links to external sources would not open. It appears that each time you click on the page, you have to make an adjustment. The info does not get saved and when you return and go to the same page, it still doesn't open. I have been told by our IT people, it is because we reside in a protected site, and your last upgrade, won't allow a page from an unprotected site to open when it is being accessed from a protected site. I sure hope that you do another upgrade quick to fix this situation. The issue is with mixed pages.
Alla svar (1)
Sorry, but this new feature is a security enhancement for Firefox users, so it's not something that needs to be "fixed".
https://blog.mozilla.org/security/2013/05/16/mixed-content-blocking-in-firefox-aurora/
Each user can disable this feature on a per site basis,, and won't have to deal with it a second time at a particular website.
https://support.mozilla.org/en-US/kb/how-does-content-isnt-secure-affect-my-safety
https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/
As inconvenient as this feature is for websites such as yours, in the long run your school is going to have to fix your website so that "mixing" content isn't done.
There are two extensions for Firefox 23.0 {and above} which a user can install to allow them to "toggle" the two preferences for mixed content blocking via toolbar buttons which might be a little more convinient, but both extensions will affect the users security when either is turned off Temporary "fix" at best until the websites that use mixed content are properly fixed.
https://addons.mozilla.org/en-US/firefox/addon/toggle-mixed-active-content/?src=search
https://addons.mozilla.org/en-US/firefox/addon/toggle-mixed-display-conten/?src=search